The fight broke out at 5:30 p.m. local time (8:30 p.m. ET) in the Santa Rita Unit yard, Bill Lamoreaux, an Arizona Corrections spokesman said, according to the report. Tactical Support Unit teams and prison personnel regained control of the yard within a half hour.

Reuters reported that officers secured the yard without the use of force.

The prison staff member who was hurt suffered an injury to the ribcage, Lamoreaux added.

The prison complex has 5,150 beds, while the Santa Rita Unit has 768 beds, 727 of which were occupied Thursday.